Rutherford experimented with 38 metals‚ he found that the positive charge of each element nucleus increased by one from element to element as they were arranged in mendeleevs periodic table‚ lead to modern definition of atomic number (# of protons in atoms nucleus) and the recognition the atomic number was basis of organization of periodic table. 2. Describe the organization of the modern periodic table. Arranged from left to right in rows (periods) by increasing atomic number and top to bottom in columns
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across a period C) down a group and from left to right across a period D) up a group and from right to left across a period E) down a group; the period position has no effect 5) Screening by the valence electrons in atoms is __________. A) more efficient than that by core electrons B) less efficient than that by core electrons C) responsible for a general increase in atomic radius going across a period D) essentially identical to that by core
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Wendy Ellison Scott Vaughn ENGL 3150 I Stand Here Ironing Motherhood is filled with great joy‚ but there are many challenges along the way that can be rewarding and damaging to both mother and child. Tillie Olsen gives us a look into the hardships that poverty and absence caused a young family in I Stand Here Ironing. All parents want better for their children‚ but the hardships caused by poverty can hinder the ability to create strong relationships and make positive choices for the children
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Prepared by Prepared for Group 4 Syed Munir Khasru Section B Professor Mushreka Afroze Khan (RH- 68) Sawmik Islam (ZR- 78) Jidny Rubaiyat Shoummo (ZR-85) Lubzana Afrin (RH- 94) Mehnaz Fatima Khan (RH-107) Arman Pavel (ZR-120) Date of submission: December 19‚ 2012 Institute of Business Administration University of Dhaka December 19 2012 Syed Munir Khasru Institute of Business Administration University
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Chapter 4: Nucleic Acids and the RNA World 1. 4.1 – What is a Nucleic Acid? * Nucleic acids are made up of monomers called nucleotides * Three components of a nucleotide: 1. Phosphate group—attached to the 5’ carbon 2. Sugar – carbonyl group and several hydroxyl groups 3. Nitrogenous base * The prime (‘) symbols indicate the carbon being is part of the sugar—not attached to the nitrogenous base. * Four different nucleotides‚ each of which contains a different nitrogenous
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A carbohydrate is an organic compound that consists only of carbon‚ hydrogen‚ and oxygen‚ usually with a hydrogen:oxygen atom ratio of 2:1 (as in water); in other words‚ with the empirical formula Cm(H2O)n. The carbohydrates (saccharides) are divided into four chemical groupings: monosaccharides‚ disaccharides‚ oligosaccharides‚ and polysaccharides. In general‚ the monosaccharides and disaccharides‚ which are smaller (lower molecular weight) carbohydrates‚ are commonly referred to as sugars.
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PHYSICS The nuclear atom All matter is made up of atoms which consist of a central nucleus‚ surrounded by electrons. Inside the nucleus are protons and neutrons. Particle Relative mass Charge Location Proton 1840 + Nucleus Neutron 1840 0 Nucleus Electron 1 - Outside nucleus Proton or atomic number (Z) This is the total number of protons in the nucleus of an atom. Nucleon or mass number (A) This is the total number of protons and neutrons in the nucleus of an atom. Note: a nucleon is
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The Uses of water in Living Things Topics I have chosen to cover: - Osmosis & Water potential - Condensation & Hydrolysis Reactions - Digestion – the importance of water - Blood and tissue fluid To emphasise the sheer importance of water in living things and to put the content of this essay in to perspective‚ I am firstly going to inform you that the human body is approximately 50-75% water. Without water our body would be unable to successfully perform the numerous complex reactions and
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Ozone Layer Depletion [ Language & Communication Skills ] Contents Abstract | 1 | Introduction | 2 | Findings: Factor of ozone depletion | 3 | Effect of ozone depletion | 4 | Solution of ozone layer | 5-6 | Conclusion | 7 | Recommendation | 8 | References | 9-10 | Appendices | 11-13 | Bibliography | 14 | Abstract Ozone is concentrated in the ozone layer ‚ which is located in the stratosphere. It plays an important role to protect humans and
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September. 19/2013 10. Atom: Smallest particle of an element that displays the properties of that element. 11. See page 12. a) Ionic bonds are chemical bonds in which ions are attracted to each other by opposite charges. b) Covalent bonds are chemical bonds in which atoms share one pair of electrons. c) Hydrogen bonds are weak that aries between a slightly positive hydrogen atom of one molecule and a slightly negative atom of another molecule or between two
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